Reddit could become an email replacement. My college campus has all-campus email that anyone can send to. Discussions in email simply don't turn out well, there's no good way to respond to just one person while letting everyone view it, there's no good way to voice agreement or disagreement, and it's mixed in with much more important information.

Reddit would be perfect for it, and for campuses with less generous email policies. It doesn't interfere with work communication and its better suited for the sort of discussions and arguments that email often plays host to.

As a student, I can't speak much for companies. And I'm aware of Reddit's recent College promotion and how easy it is to make, moderate, etc a new Reddit. But a dedicated Reddit integrated with college websites or email could be a profit stream.